Interesting technique. For this type of accent work I usually extrude the text into the surface 1-2 layers deep. At that layer I'll swap filaments, print 2 more, than swap back to my original color. This achieves the same effect in a slightly different way.

I have some Octoprint Pause scripting that will auto park the print head and lock all motors. It will hold the job while you swap filaments. Upon restart it will do a purge in place, rehome XY, then continue its job from its pause coords.

If you increase your z-hop on retraction enough, you can make these colors more than one layer and still avoid them with subsequent colors, which helps if you've got a light color that needs a couple layers to be fully opaque, like a yellow.

So I put the text on the top and make it 2 layers higher- I have cura pause the print on last layer before text, swap filament, and then finish the print. It makes a nice raised text effect and doesn’t required modifying the gcode. Downside of course is the text is on the top instead of the smooth side, but I like the effect and it’s easy! Nice print though!

That is pretty clean looking.

We do this at the lab I work at! It's really effective and super easy. My boss had me whip up a bunch of signs using this method to designate our different work stations.

That's really cool! Could you write out with more detail how you do this type of color switching?